Cleaning Smartphone Data.

Cleaning Smartphone data can be done by you or by someone else under your supervision. Whenever you want to give your phone to another person or to dispose it, it is necessary to clean all the data inside of the phone and to remove your SIM card and memory card from it. To clean all the data that are stored in the phone, simply go to factory reset and all the data inside of the Smartphone will be vanished. Don't know to do factory resetting? You can contact a nearby communication center to do the task.

Then format your phone's memory card to remove all the remaining photos and video clips. Now you can present your old Smartphone (or Tablet) to someone else, sell it or dump it. You must care about those data that you had saved in that device. Not only count for those visible data but also for those usernames and passwords, Files, video and images that you had deleted normally can't be recovered. Be warned, it is possible for people to recover those deleted data in Smartphone by using any of the recover software that are freely available in the internet.

So if you are planning to leave your Smartphone in another persons' hand, follow these steps before to give away.
Use your existing net work service providers' service to back up all your contacts and data.
Or use Google Dive or Cloud to store your important files.
It is very difficult to recover your data later, once you had left it with your device.

Make sure you got enough battery power to delete the data and it is better to get it plugged in to the power source as the process will take hours to clean the device.
If your operating system is Android,
First Eject your SD card from the device and insert a new SD card in to it.
Start the Data cleaning process.
First go to "Setting"
Then to "Security" to "Encrypt phone (Tablet)"

If your device operating system is Android 5.0 or higher version,
Go to settings to Security to Screen lock

Create a strong password which must look like this Peter@$568
In this process you will be asked to encrypt the SD card. It is not necessary as you can remove it from the device to use in your new device.
From the Settings > Backup & reset > Factory data reset there tap Reset phone.
The process will take more than an hour.
Remove the SD memory card.

Now your device is free without any of your data and no one can recover any data from it.
To make sure, bring in new large files and make the device storage (flash memory) to be full. Then delete all of those files.

Still worried?
Install the app iShredder to digitally "shred" the data.
Now you can feel free to give away the device.